Method and apparatus for coating surfaces



@et 1, 1929. J. P. MCLIMANS ET AL,

METHOD AND APPARATUS FOR COATING SURFACES Filed April 16. 1924 Patented @cto l, NQ@

JOHN 5*?. MCLTMANS' AND HUWARD :METHOD .ND APPARAT''S FR CATNG SURFACE?) Application nieu aprn ie,

This invention relates to neW and improved method and apparatus for coating surfaces and more particularly to a method and apparatus for applying to surfaces, a coating of material rendered liquid by heat.

A particular application of our invention consists in the application of" liquid sulphur to the Walls of tanks or the like for the purpose oin` acid prooiing such Walls. The acid prooiing of 'walls by means of a sulphur coating has been used in the pasty the sulphur being melted in the tanks and applied to the walls by being thrown or splashed against the Wall. rllhis method or? application is not satisfactory because the coating is unevenl applied and is applied in separate sms amounts Which do not adequately adhere o each other and to the Wall9 so the coating readily breaks avvay from the Wall in irregular patches.

vlWhile this one use oi2 our method and apn paratus will he particularly described in detail, it is to be understood that it may be used in the application of any coating oiE material rendered liquid by the application of heat, among which may he mentioned various bituminous or other compounds. p

lt is an object of the present invention to apply a new and improved method and apparatus whereby a liquid may be applied While heated to coat a surface in such manner asto provide a uniform coating applied With suf'rlcient force to cause it to adhere to the surface.

lt is a further obj ect to provide means and method of this character in which the material is applied hy gas under pressure and the gas and liquid are both heated immediately adj acent their point oit application,

@ther and further objects will appear as the description proceeds.

wWe have illustrated a preferred embodiment ot our invention inthe accompanying drawings, in Which- Figure l is a view orn the apparatus, the heating chamber and housing heing shown in section;

Figure 2 is a view or the heating chamber housing as seen trom above; and

i924. Serial Elo. 1Q/05,965.

Figure 3 is a section taken on line 3,--3 oi' igure l.

rlfhe gas hose ll is connected hy coup ng l2 to the pipe 13 which has a portion la entending Within the gas chamber l5. The discharge pipe lf3 entends rroin the chamber l5 and its inner portioi- V7' entends into the chamber beyond the ends le pipe le. N discharge pipe i6 is connected hy m f the liquid discharge eine i9. nozzle 2G entends iromthe c the pipe L5. The lower carrying pipe 'i9 er; tank 2l in which the liquic is coirtainedo The gas chainher 15 adjacent i tion or" the liquid pipe l5 are enclosed I heat retaining housing Q2 which rn y c formed of asbestos or similar material. either side of the chamber l5 pipe Qare located the two resistance elements 23 l 2a. elements are connected hy the vvire 25 are connected to any su able source electrical current by me of Wires 2o 27.

ln the use of the apparatus by our met io the bucket or tank 2l will he iilled Wit? th material to be applied. This material have been previously heated in a general supply tank, to such a degree as to render it substantially fluid.' rlfhe dow or' gas und pressure is introduced from hose' ll into gas chamber l5 through the extended pipe l. By the term gas7 We mean to include coinpressed air or steam or any suitable under pressure. The gas under pressure taires a circuitous path through the'chamber l5 and passes out through the discharge pipe l? and across the T 18 through the nozzle 20. The circuitous pathin the gas chamber causes the gas to he retained in such chamber for appreciable period or time during which it is heated hy means or the heat derived rorn the resistance elements 23 and fis the flows out across the T i8, it induces fioiv of the coating material through the pipe 1S?. 'Lhis material is also further heat-cd in that portionV of the pipe i9 extending Within the housing` 22 adjacent the heating elements. Both the gas and their junction and their application to the surface to be coated.

'llhe coating is app-lied evenly by moving the nozzle to distribute the material as desired over the surface. llt may loe applied with any desired torce by controlling 'the pressure of the gas, so that it may be caused to firmly adhere to the surface ol the material to be coated. llt will be understood that if highly heated steam is used as the gas or applying the liquid, it may be unnecessary to apply any heat by means of the electrical resistance element. ln this case,

the steam in passing through the gas chamber will heat the liquid in the adjacent pipe `We have illustrated one preferred form of our invention by Way or example, but it is to be understood that We contemplate such changes and modilications as come Within the spirit and scope of the accompanying claims.

We claim:

1. Apparatus for applying a liquid coating', said apparatus comprising a gas chamber, a gas supply pipe leading to the chamber, a gas discharge pipe leading from the chamber, a liquid supply pipe connected to the gas discharge pipe in such manner that the flow of liquid is induced by the flow of gas, a portion of the liquid supply pipe extending adj acent the gas chamber and means for heating the gas chamber and the said portion of the liquid supply pipe.

2. Apparatus for applying a liquid coating, said apparatus comprising a gas chamber, a gas supply pipe leading to the chamber, a gas discharge pipe leading from the chamber, a liquid supply pipe connected to the gas discharge pipe in such manner that the flow of liquid is induced by the flow of gas, a portion of the liquid supply pipe eX- tending adjacent the gas chamber, a housing for the gas chamber and said portion of the liquid supply pipe and electrical heating elements enclosed in said housing.

3. Apparatus for applying a liquid coating, said apparatus comprising a gas chamber, a gas supply pip-c leading to the chamber, a gas discharge pipe leading from the chamber, the gas supply pipe and discharge pipe extending into the gas chamber with their ends overlapping whereby the gases are caused to take a circuitous path in the chamber, a liquid supply pipe connected to the gas discharge pipe 1n such manner that the flow of liquid is induced by the iiow of gas,

and means for heating the gas chamber.

Signed at Duluth, Minnesota, this 1st day of April, 1924.

JOHN P. MCLIMANS. HUWARD S. CRESS. 

